Well, this is definitely a glitch for the ages. The image above shows a player with a weapon that has +65,535 damage. Eastonator12 took out a Lynel playing the game on Switch, but the game crashed shortly after. No data was lost and everything seemed fine, until he checked out the weapon he attained from the Lynel kill. Interestingly enough, that number is the maximum value for a 16bit unsigned integer in the world of programming. Basically, glitch or no glitch, that’s the highest possible value in that specific situation.
Here’s video evidence of him one shoting Calamity Ganon:
Of course, you may have some doubt about this and you’re right for having some. While the user (on Reddit) claims this is the Switch version, the only UI element that can give away which version it is conveniently cut off in the video. On top of that, the game itself does not autosave after defeating a Lynel. So he would have returned to a state before defeating it. Lastly, he claimed it’s the Gold Lynel in the Coliseum on Master Mode – which it literally could not be because that Lynel’s sword is of the flaming variety.
Thus, the standing theory is that while he probably does have this item and did one shot Calamity Ganon, it’s actually a modified Wii U copy being played via emulator, which has notable random crashing issues and save states to save whenever you want. It would also explain why the image of the item is taken with a phone, as the screenshot functionality actually crashes the emulator when you try to use it.
In the end, it’s a big he said, she said situation. Regardless, it’s pretty interesting seeing the pure power of this weapon in action.